My C++ solution, using DFS & vector, no need for v.pop_back


  • 0
    S
    class Solution {
    public:
    	vector < vector<int> > res;
    	void dfs(int n,int k,int cnt,int st,vector<int>&tmp){
    		if (cnt==k) {
    			res.push_back(tmp);
    			return;
    		}
    		for (int i = st; i<=n; i++){
    			tmp[cnt] = i;
    			dfs(n,k,cnt+1,i+1,tmp);
    		}
    	}
        vector< vector<int> > combine(int n, int k) {
    		vector <int> tmp(k,0);
    		dfs(n,k,0,1,tmp);
    		return res;
        }
    };

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